My macbook air shuts down instead of going to sleep.

My MacBook Air running OSX 10.7.5 shuts down rather than going to sleep when left unused for a short period.
I notice this started about 3 or 4 days ago.
It doesn't matter if it is connected to the power supply or running from battery.
I haven't made any changes to system preferences.
Any Ideas.
It did a similar thing when I first got it and it had to back to Apple to have most of it's innards replaced under warranty.
Regards,
Joe

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and  Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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    com.apple.driver.AppleHDA 266.5
    com.apple.driver.AppleUpstreamUserClient          3.6.1
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    com.apple.driver.AppleHV    1
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    com.apple.driver.AppleLPC  1.7.3
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    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless      1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib  1.0.0d1
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    com.apple.driver.XsanFilter 404
    com.apple.iokit.IOAHCIBlockStorage           2.6.5
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    com.apple.driver.AppleAHCIPort     3.0.7
    com.apple.driver.AppleUSBHub      705.4.1
    com.apple.driver.AppleUSBXHCI     705.4.14
    com.apple.driver.AppleUSBEHCI     705.4.14
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    com.apple.driver.AppleRTC  2.0
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    com.apple.security.quarantine        3
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    com.apple.driver.AppleIntelCPUPowerManagement        218.0.0
    com.apple.kext.triggers         1.0
    com.apple.driver.AppleBluetoothHIDKeyboard    175.5
    com.apple.driver.AppleHIDKeyboard         175.5
    com.apple.driver.IOBluetoothHIDDriver    4.3.0f10
    com.apple.driver.AppleMultitouchDriver   260.30
    com.apple.iokit.IOSerialFamily         11
    com.apple.driver.DspFuncLib          266.5
    com.apple.kext.OSvKernDSPLib      1.15
    com.apple.iokit.IOAudioFamily         200.6
    com.apple.vecLib.kext           1.2.0
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    com.apple.iokit.IOBluetoothHostControllerUSBTransport            4.3.0f10
    com.apple.iokit.IOBluetoothFamily  4.3.0f10
    com.apple.iokit.IOUSBUserClient     705.4.0
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    com.apple.driver.AppleSMBusPCI   1.0.12d1
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.driver.AppleSMC 3.1.9
    com.apple.driver.IOPlatformPluginFamily 5.8.0d49
    com.apple.driver.AppleHDAController        266.5
    com.apple.iokit.IOHDAFamily           266.5
    com.apple.iokit.IOSurface     97
    com.apple.iokit.IOAcceleratorFamily2         156.4
    com.apple.AppleGraphicsDeviceControl     3.7.21
    com.apple.iokit.IONDRVSupport      2.4.1
    com.apple.driver.AppleSMBusController    1.0.13d1
    com.apple.iokit.IOGraphicsFamily    2.4.1
    com.apple.iokit.IOSCSIBlockCommandsDevice       3.7.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice        3.7.0
    com.apple.iokit.IOBDStorageFamily 1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily 1.7.1
    com.apple.iokit.IOUSBMassStorageClass     3.7.0
    com.apple.iokit.IOSCSIArchitectureModelFamily   3.7.0
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    com.apple.driver.AppleUSBComposite        705.4.9
    com.apple.driver.AppleThunderboltDPInAdapter            4.0.6
    com.apple.driver.AppleThunderboltDPOutAdapter         4.0.6
    com.apple.driver.AppleThunderboltDPAdapterFamily    4.0.6
    com.apple.driver.AppleThunderboltPCIDownAdapter     2.0.2
    com.apple.driver.AppleThunderboltNHI    3.1.7
    com.apple.iokit.IOThunderboltFamily         4.2.1
    com.apple.iokit.IOEthernetAVBController  1.0.3b3
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    com.apple.driver.mDNSOffloadUserClient 1.0.1b8
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    com.apple.iokit.IOUSBFamily            705.4.14
    com.apple.driver.AppleEFINVRAM  2.0
    com.apple.driver.AppleEFIRuntime            2.0
    com.apple.iokit.IOHIDFamily            2.0.0
    com.apple.iokit.IOSMBusFamily       1.1
    com.apple.security.sandbox 300.0
    com.apple.kext.AppleMatch 1.0.0d1
    com.apple.driver.AppleKeyStore     2
    com.apple.driver.AppleMobileFileIntegrity            1.0.5
    com.apple.driver.AppleCredentialManager           1.0
    com.apple.driver.DiskImages           389.1
    com.apple.iokit.IOStorageFamily      2.0
    com.apple.iokit.IOReportFamily       31
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform         3.1
    com.apple.iokit.IOPCIFamily 2.9
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto     1.0
    com.apple.kec.Libm   1
    com.apple.kec.pthread          1
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    Graphics: NVIDIA GeForce GT 640M, NVIDIA GeForce GT 640M, PCIe, 512 MB
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    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533643465238432D50422020
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    Bluetooth: Version 4.3.0f10 14890, 3 services, 27 devices, 1 incoming serial ports
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    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
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